Dr. Steven Y. Ko, MD
Internal Medicine (Internal Medicine Physician)
9961 Sierra Ave
Fontana, CA 92335
Who else practices at this address →
San Bernardino County includes primary care (5% of residents) and mental health (26% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Virginia Commonwealth University, School of Medicine (2014)
- Years since graduation
- 12
- In the NPI registry since
- 2014
- Medicare patients seen, 2024
- 125
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2014Medical school: Virginia Commonwealth University, School of Medicine
- 2014Registered with an NPI (national billing number; not a license date)
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Internal Medicine Physician primary
CA license 141088
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Antelope Valley Hospital Lancaster, CA
Medical groups
- Av Critical Care Inc (12 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 125
- Services billed
- 220
- Patients’ average age
- 69
| Service | Times | Patients |
|---|---|---|
| Critical care, first 30-74 minutes | 81 | 53 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Payments from drug and device companies
In 2025, 2 companies reported 7 payments worth $2,151 in total to this clinician.
| Intuitive Surgical, Inc. | $2,137 |
|---|---|
| Insmed, Inc. | $13.62 |
| Education | $1,500 |
|---|---|
| Travel and Lodging | $632 |
| Food and Beverage | $19.22 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Intuitive Surgical, Inc. May 2, 2025 | Education Da Vinci Surgical System · SURGERY · in-kind | $1,500 |
| Intuitive Surgical, Inc. Mar 20, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to COSTA MESA, CA · in-kind | $358 |
| Intuitive Surgical, Inc. Apr 15, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN DIEGO, CA · in-kind | $261 |
| Intuitive Surgical, Inc. Mar 7, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SANTA ANA, CA · in-kind | $6.00 |
| Intuitive Surgical, Inc. Apr 10, 2025 | Travel and Lodging Da Vinci Surgical System · SURGERY · travel to SAN DIEGO, CA · in-kind | $6.00 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.